Electric conductor of the laminated type



F KADE ELEQTRIC CONDUCTOR OF THE LAMINATED TYPE Filed April 18, 1922 Nov. 25 1924- Hg qttorneg Patented Nov. 25, 1924.

UNITED STATES 1,517,237 PATENT OFFICE.

FRIEDRICH KADE, OF CHARLOTTENBURG, GERMANY, ASSIGNOR TO GENERAL ELEC- TRIC COMPANY, A CORPORATION' OF NEW YORK.

ELECTRIC CONDUCTOR OF THE LAMINATED TYPE.

Application 'filed April 18, 1922. Serial No. 555,194.

To all 'w71 om t may concern.'

Be it known that I, FRIEDRICH KABE, a citizen of the German Republic, residing at iii- Mommsen Street, in the city of Charlottenburg, Province of lirandenburg, State lrussia, Germany, have invented a new and useful Electric Conductor of the Laminated '.lype, of which the following is a specification.

My invention relates to electrical conductors for dynamo electric machines and the like, and has for its object the construction of such a conductor out of a number of laminae, the laminze being so arranged that the conductor will. have as smooth a surface as possible.

It has been customary heretofore to construct conductors for dynamo electric machines out of a number of individual conductors or laminae in order to avoid the losses due to eddy currents occurring in conductors conveying alternating curreiit in electrical machines. If the laminze or individual conductors are connected together at the ends of each slot, it is further necessary that each lamina be placed in the various elevations of the slot in the same manner, and this may be accomplished by making each lamina out of a number of pieces oil'- set from each other, the pieces being connected bv bridges. This arrangement'makes it diiiicult, however,to place the bridges. The bridges may simply bc led outside the lamina-tions. In this case the bridges protruding outside the laminae make the bar hard to insulate. This arrangement is also objectionable from an electrical standpoint. It has been suggested to slot each lamina in order to provide a groove for receiving the bri dge, but this process is very objectionable from a manufacturing point of view. Neither is it feasible, to fill the spaces between the bridges with insulating material, in order to obtain a smooth surface, because the heat conductivity of the whole bar would be materially reduced.

By my invention all the above mentioned difficulties are obviated in a simple manner, by forming the conductor of two parallel sets of conductors, and by locating the connecting bridges between these two sets. In this manner the protruding of the connecting bridges on the outer edges of the conducting bar is avoided without the use of special processes in manufacturing, and

without interfering with the heat conductivity. I derive an additional advantage from `the fact that only half the width is required for each bridge, and thus reduce the eddy currents, which are necessarily generated by the vertical location of the bridges causing a loss of energy through cross currents.

I attain these objects by the structure illustrated in the accompanying drawing, which shows a typical example of the new conducting bar.

Referring to the accompanying drawing, Fig. l shows the stamping from which the individual laminae are formed; Figs. 2 and 3 show the nal shapes of the laminze; Fig. l shows the complete structure of a conductor embodying my invention, and Fig. 5 is a view of a modified form of my con-- ductor.

In the drawing, A and A each form one part, C and C the other parts and B- B the bridging portions or members between these parts. It will be noted that the portions A and C of each lamina are substantially pa allel and are located in different parallel planes, the bridging portion B connecting the sides of the parallel portions. In the particular arrangement shown, portions A and C extend from the bridging portion B on different sides thereof, as do the parts A and C from the bridging portion B.

F ig. t shows the complete structure of the conducting bar. In this case it is built up of two sections or sets arranged side by side, each made of seven laminae marked Al- A2- A3 A,- C1- C2- C3- and Al- A2- A3. Parts Al- A2- A3- A4 belong to one set, parts C1- C2- C3l belong to the other set. The two sets are connected by bridges Bl- Bre B,g located between said sets. Parts Al- Af- Af., which are located in the same set at C1- C2- Cn have corresponding pieces, which are in the same manner located in set A1- A2 A3. It will be noted from the drawing that the top and bottom laminas of both sets terminate at different distances from the end of the conductor whereby other laminze will become the top and bottom laminze successively, and that the top laminze A,- A2 A, of one set are connected to the bottom laminae Cl- C2-n Cs of the other set by the bridging members Bl- B-- B3, and the top lamina; Al- A2- A', ot the other set are connected to the bottom laminae ot the irst mentioned set by other bridg'ing members, the bridging members being located at different distances from the end of the conductor. The upper well as the lower Surfaces ot the condncting bar will not be fiat as is the case in other customary makes. In practice a surface sulliciently flat may be obtained by breaking the sharp corners. Itl this should not be satisfactory wedge shaped piecesinay be inserted for obtaining perfectly tlat surtaces, see `Fig. D. rIhese wedges may be made of metal and be riveted to the lamina which terms its bearing.

It is .not essential to shape the lamina as described, where the bridge connects two pieces located in a right and left set.

I desire it to be understood that my invention is not limited to the construction shown and described, and I aim in the appended claims to cover all modilications which do not depart from the spirit and scope ot' my invention.

Having thus described my invention I claim:

l. In a dynamo electric machine, an electrical conductor comprising a number oi laminze, -each consisting of two substantially parallel portions loc-ated in different parallel planes and a bridging portion connecting thesides ot said parallel portions, .the laminzc forming the conductor being assembled in two sets arranged side by side with the bridging portions located between said sets.

2. In a dynamo electric machine, an electrical conductor comprising a number of laminaz, each lamina consisting vof two substantially `parallel portions located in dit tercnt parallel planes and a. bridging portion connecting the sides ot said parallel portions, the parallel portions extending troni the bridging portion on different sides thereof, the laminae forming the conductor being assembled in two sets arranged side by side with the bridging portions located between said sets.

3. In a dynamo electric machine, an elect-rical conductor comprising laminas assembled in two sets, said sets being arranged side by side, the top and bottom lamin o't said sets successively terminating at ditterent distances trom the end ot the conductor whereby other laminae become the top and bottom laminze successively, said top and bottom laniime being connected by bridging members, said bridging members being located between said sets of laminie at ditllerent distances :trom the end ot the conductor.

4. In a dynamo electric machine, an electrical conductor comprising laminze assembled in two sets, said sets being arranged side by side, the top and bottom laminze ot said sets successively terminzlting at different distances trom the end ot the conductor whereby other laminae become the top and bottom laminae successively, the top laminze oit one set being connected to the bottoni laminie ot the other set by bridging members, the top lamina: ot the other set being` connected to the bottom laminae of the rst set by bridging members, said bridging members being located between said sets ot laminze and at ditferent distances from the end of the conductor.

In witness whereof, I have hereunto set my hand this twenty-'fourth day of March, 1922.

FRIEDRICH KABE. 

